For the burst shot, I would recommend "Turbo camera". I saw the review on this website too.

It's good for taking a burst shot (but at 3MP quality) and it also has the "Tap to focus" ability (that's mean, Lumia 920 can do the tap to focus but don't know why it not available in the stock camera)

One cons of this app is, it took sometime to start up, hope the dev will update and fix this soon.